JP2001352630A - Guide wire for electrical wiring - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a guide wire for electrical wiring, which can improve the cable guide workability significantly and has sufficient strength and durability. SOLUTION: This guide wire is used for introducing a wire into a conduit and has a composite wire element, composed of synthetic resin monofilaments and a metal wire as a basic structure.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a nominal wire for electric wiring used for guiding electric wires in a pipe, and more particularly, to a wiring work for a pipe having a very low resistance and particularly having a bent portion. The present invention relates to a wire for electrical wiring having excellent properties and sufficient strength and durability.

[0002]

2. Description of the Related Art In general, electrical wiring work inside and outside a house, building, factory, etc. is performed by passing electric wires through a previously laid wire pipe at the stage of completing the interior work. Have been.

[0003] In this wiring work, the electric wires are first passed through the pipes by mainly pushing a linear body called a nominal line, and then the electric wires are connected to the terminal of the nominal line. It is implemented by connecting and then pulling the nominal wire out of the pipe.

[0004] In the above-mentioned wiring work, a steel wire is mainly used as a nominal wire for guiding an electrical wire into a pipe and passing the wire. The drawbacks are that it is heavy and difficult to handle, and that the decoration and interior are liable to be damaged during use due to its stiffness and stiffness.

[0005] As the nominal wire 20 having the above-mentioned disadvantages improved, a wire made of a linear body made of a synthetic resin such as polyacetal as shown in FIG. 3 is known. However, this conventional synthetic resin nominal wire 20
Have a fatal drawback that they are easily damaged during use and are easily cut by the damage. This disadvantage can be improved to some extent by appropriately stretching the synthetic resin filament as a raw material and giving it an appropriate strength. However, the nominal wire 20 made of a synthetic resin stretched linear body is not easily wound. However, it has a drawback that it is extremely difficult to penetrate a pipe that is long and has many bent portions and has high frictional resistance.

Under these circumstances, the applicant of the present invention has studied for the purpose of obtaining a call line having sufficient strength and excellent wire passing ability, and as a result, as shown in FIG. The inventor of the present invention found that the electrical wiring nominal wire 22 composed of a stranded wire obtained by twisting and fixing the monofilaments 21 made of a monofilament 21 was suitable for the above-mentioned purpose, and was previously proposed (Japanese Utility Model Publication No. 61-22424 and 3-36177
Issue publication).

[0007] The electrical wiring nominal wire 22 proposed by the applicant of the present invention has no twisting and has a stranded wire structure, so that it is passed through the pipe in a point contact state. The wire resistance is small and workability is considerably improved.

However, as a result of repeating more detailed practical tests, the above-mentioned nominal wire 22 made of a stranded wire proposed by the present applicant has been found to have improved bending workability. It has been found that there is still a limit in the workability of the wire when the wire is passed through a pipe having a complicated shape having a plurality of continuous portions.

[0009]

SUMMARY OF THE INVENTION The present invention has been achieved as a result of studying to solve the above-mentioned problems in the conventional wiring for electric wiring.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to improve the line resistance, particularly in the case of conducting a wire in a complicated-shaped electric pipe having a plurality of bent portions continuously, to extend the distance of the wire and to perform the wire work. An object of the present invention is to provide a wire for electrical wiring, which has greatly improved performance and has sufficient strength and durability.

[0011]

In order to achieve the above-mentioned object, a wire for electric wiring according to the present invention is a wire used for guiding an electric wire in a pipe, and is composed of a monofilament made of synthetic resin. The basic structure is a composite linear body composed of a metal wire.

As the composite linear body, a composite stranded wire in which a synthetic resin monofilament and a metal wire are twisted with each other, a plurality of synthetic resin monofilaments around a metal wire having a core as a core. Twisted composite stranded wire, twisted composite wire obtained by applying twist to a metal wire fitting resin wire in which a metal wire is fitted in a groove extending in the axial direction of the outer periphery of a synthetic resin monofilament, or the metal It is preferable to use a composite twisted wire in which a plurality of wire-fitting resin wires are twisted.

Further, the synthetic resin monofilament is obtained by melt spinning and hot drawing of a polyester resin, wherein the metal wire is a steel wire, a copper wire or an aluminum wire, and has a diameter of 0.5-3.0
mm is preferable.

[0014]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a wiring for electric wiring according to the present invention.

FIGS. 1 (A) and 1 (B) are front views showing a first embodiment of a wiring line for electric wiring according to the present invention, and FIGS. 2 (A) and 2 (B) are diagrams showing a wiring line for electric wiring according to this invention. It is a front view showing a 2nd example.

The nominal line for electric wiring of the present invention has a basic structure of a composite linear body composed of a synthetic resin monofilament and a metal wire. A composite twisted wire structure composed of a monofilament made of metal and a metal wire (first embodiment), a twisted composite wire structure in which a twist is applied to a metal wire fitting resin wire, or a plurality of the metal wire fitting resin wires are twisted. Combined composite stranded wire structure (second embodiment)
Are roughly divided into

FIGS. 1A and 1B show the first embodiment. The composite linear body 10 shown in FIG. 1A is composed of a plurality of synthetic resin monofilaments 11 and one metal wire 12. 1B, and the composite linear body 10 of FIG. 1B has a single metal wire 12 as a core, and a plurality of (five in the drawing) composite around the core. 1 shows a composite stranded wire structure in which resin monofilaments 11 are twisted.

In the first embodiment, the number of the synthetic resin monofilaments 11 and the number of the metal wires 12 in the composite stranded wire can be arbitrarily selected.
It is desirable that the ratio occupied by 2 be 50% or less, since this does not cause an increase in the weight of the nominal line.

The cross-sectional shapes of the synthetic resin monofilament 11 and the metal wire 12 in the first embodiment may be irregular cross-sections such as a triangle, a quadrangle, and an ellipse, in addition to the circles shown in the figures.

By providing such a composite linear body 10 having a stranded wire structure, the surface of the nominal wire made of the composite linear body 10 comes into contact with the pipe by point contact. Not only is improved, but also the combined use of the metal wires 12 can ensure sufficient strength and durability.

2 (A) and 2 (B) show the second embodiment. The composite linear body 10 shown in FIG. 2 (A) extends in the direction of the outer peripheral axis of the synthetic resin monofilament 11. A twisted composite wire structure in which a metal wire is fitted in the formed groove 13 and a torsion is applied to the resin wire 14, and the composite linear body 10 in FIG. A composite twisted wire structure in which a plurality of (three in the drawing) resin wires 14 are twisted is shown.

In the second embodiment as well, the ratio of the metal wire 12 occupying each section of the twisted composite wire and the composite stranded wire is arbitrary, but the ratio of the metal wire 12 occupying the cross-sectional area is 50%. % Or less is desirable because it does not increase the weight of the nominal line.

In FIG. 2 (A), the cross section of the synthetic resin monofilament 11 is shown as a triangle, but it may be a circular, square, elliptical or other irregular cross section. In FIG. 2 (B), Although the cross section of the synthetic resin monofilament 11 is shown as a circle, in addition to the circle,
Irregular cross sections such as a triangle, a quadrangle, and an ellipse can also be used.

By forming the composite linear body 10 having such a twisted composite linear structure or a composite stranded linear structure, the surface of the nominal wire made of the composite linear body 10 is brought into point contact with the inside of the pipe. In addition to improving the wire workability, it is possible to secure sufficient strength and durability by using the metal wire 12 together.

The synthetic resin monofilament 11 used in the present invention is a thermoplastic resin having heat shrinkability and heat fixability, for example, nylon 6, nylon 66, nylon 61.
After melt-spinning polyamide such as 0, polyester such as polyethylene terephthalate and polybutylene terephthalate, and polyolefin such as polyethylene and polypropylene by a normal melt spinning method, a relatively thick material having a diameter of about 1 to 6 mm obtained by drawing is obtained. Is a monofilament.

These synthetic resin monofilaments are:
Conventional additives such as heat-resistant agents, weathering agents, light-proofing agents, plasticizers, lubricants, antistatic agents and dyes and pigments can be contained. Forming a lubricant-containing layer such as polyorganosiloxane or ethylenebisstearylamide at least on the surface of the monofilament at the time of melt spinning or after the melt spinning is advantageous, because the resistance of the nominal wire can be further improved. It is. In addition, especially when a coloring agent such as a fluorescent pigment or a luminous pigment is contained, the visibility and workability of the electrical wiring nominal line when the wiring work is performed in a dark place such as a building where construction has not yet been completed. Improved and advantageous.

As the metal wire 12 used in the present invention,
0.5 to 3.0 mm in diameter, preferably 1.0 to 2.0
mm steel wire, copper wire or aluminum wire. When the diameter of the metal wire 14 is less than the above range, the composite linear body 10 is too thin and the stiffness of the composite linear body 10 is weak, and the penetrating power of the pipe tends to be inferior from the hand to the tip. Also, the stiffness of the composite linear body 10 becomes too strong, and the frictional resistance is large at the bent portion of the pipe, and the workability tends to be poor.

In the composite linear body 10, FIG.
2 (B) and FIG. 2 (B), a plurality of, for example, 2 to 5 synthetic resin monofilaments 11 and metal wires 12 are fitted, or a plurality of, for example, 2 to 5 metal wire fittings. After the resin wire 14 is heated while being twisted in a tension state, and substantial twisting and heat setting are caused,
It is manufactured by quenching.

FIG. 2A shows the composite linear body.
Is manufactured by heating the metal-fitted resin wire 14 while applying a twist in the longitudinal direction in a tensioned state, causing substantial torsion and heat fixing, and then quenching. Is done.

The wire diameter of the composite linear body 10 having the above structure is not particularly limited, and is appropriately selected according to the length and thickness of the pipe to be used. Those having a size of about 12 mm are preferably used.

The nominal wire for electric wiring according to the present invention having the above-described composite linear body 10 as a basic structure has sufficient strength and durability and, in particular, an electric pipe having a complicated shape having a plurality of continuous bent portions. In this case, the line resistance when passing through the inside is improved, so that the distance of the line and the workability of the line are greatly improved.

[0032]

Embodiments The configuration and effects of the wiring for electrical wiring according to the present invention will be further described below with reference to embodiments. [Examples 1 to 3, Comparative Examples 1 and 2] Polyethylene terephthalate was extruded from a die by a conventional melt spinning method, cooled, and then hot-drawn to obtain a polyester monofilament having a circular cross section of 2.6 mm in diameter. The two wires and one galvanized iron wire having a diameter of 2.0 mm were aligned and twisted at 35 turns / m.
After a heat treatment for 5 seconds, the wire was quenched with room temperature water and twist-fixed to produce a nominal wire (No. 1) composed of a 6 mm diameter composite linear body having a composite stranded wire structure shown in FIG. 1 (A). .

In producing the polyester monofilament, a monofilament having a 1.6 mm wide groove in the outer peripheral axis direction is obtained by using a triangular die provided with a concave line, and the monofilament is inserted into the concave groove. The diameter of one galvanized iron wire of 1.6 mm in diameter is 4.
A 5 mm triangular cross section metal wire fitting resin wire was obtained. Next, while giving a twist of 35 times / m to this metal wire fitting resin wire,
After a heat treatment at 200 ° C. for 45 seconds, quenching with water at room temperature and twist fixing are performed, and a nominal wire (about 6 mm in diameter) having a twisted composite wire structure shown in FIG. No. 2) was manufactured.

In producing the polyester monofilament, a monofilament having a concave groove having a width of 1.0 mm in the outer peripheral axis direction is obtained by using a circular die having concave grooves, and the monofilament has a concave groove. The diameter of one galvanized iron wire having a diameter of 1.0 mm is 4.
3 pieces of 5mm triangular cross section metal wire fitting resin wire are aligned and 3
Twisted at 5 times / m, heat-treated at 200 ° C for 45 seconds, quenched with water at room temperature, and twist-fixed.
A nominal line (No. 3) composed of a composite linear body having a diameter of 6 mm and having the composite line structure shown in (B) was manufactured.

A nominal line (N) of the structure shown in FIG. 3 consisting of a single line of polyacetal monofilament having a diameter of 6.0 mm
o. 4) was prepared.

The above No. 2.6 diameter used for 1 nominal line
3 mm polyester polyester terephthalate monofilament with a circular cross section of 35 mm / m
After being heat-treated at 45 ° C. for 45 seconds, it is quenched with room temperature water and twist-fixed to form a stranded wire having a diameter of 6 m having a stranded wire structure shown in FIG.
m No. 5 (No. 5) was manufactured.

The following wiring tests were performed using each of these five types of electrical wiring wires, and the results of evaluation of the workability of the wiring are shown in Table 1.

In the line test, the piping shown in FIG.
A pipe formed by connecting the straight pipes 2 with a 0 ° angle elbow 1, wherein each corner ab, bc, cd, de, e-
The distance between f, fg, gh, hi, and ij is 3.7 m, and each nominal line is pushed from point A into a pipeline with an inner diameter of 22.2 mmφ, and each corner is pushed to each corner. This was performed by determining the passage property and the reach distance.

[0039]

[Table 1] As is clear from the results in Table 1, the wire No. for electrical wiring according to the present invention. 1 to 3 are nominal wires N for electrical wiring for comparison
o. As compared with the methods 4 and 5, the workability of the wiring is extremely excellent.

[0040]

As described above, the nominal wire for electric wiring of the present invention has a sufficient strength and durability because it has a basic structure of a composite linear body composed of a synthetic resin monofilament and a metal wire. In particular, the wire resistance in the case where a wire is passed through an electric pipe having a complicated shape having a plurality of bent portions continuously is improved, so that the length of the wire and the workability of the wire are greatly improved.

[Brief description of the drawings]

FIGS. 1A and 1B are front views showing a first embodiment of a wiring line for electric wiring according to the present invention.

FIGS. 1A and 1B are front views showing a second embodiment of a wiring line for electric wiring according to the present invention.

FIG. 3 is a front view showing an example of a conventional electric wiring nominal line.

FIG. 4 is a front view showing another example of the conventional electrical wiring call line.

FIG. 5 is a front view showing an example of a pipe for performing a wiring work by applying the electrical wiring nominal line of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 90 degree angle elbow 2 Straight pipe a-j Piping corner 10 Composite linear body 11 Monofilament made of synthetic resin 12 Metal wire 13 Groove 14 Metal wire fitting resin wire

Claims (6)

[Claims] 1. An electrical wiring, which is a nominal wire used for guiding an electric wire in a pipe and has a basic structure of a composite linear body composed of a synthetic resin monofilament and a metal wire. Nominal line. 2. The nominal wire for electric wiring according to claim 1, wherein the composite linear body is composed of a composite stranded wire in which a synthetic resin monofilament and a metal wire are mutually twisted. 3. The composite linear body according to claim 1, wherein the composite linear body is a composite stranded wire having a metal wire as a core and a plurality of synthetic resin monofilaments twisted around the core. Nominal wire for electrical wiring. 4. A torsion composite in which the composite linear body is provided with a metal wire fitting resin wire in which a metal wire is fitted in a groove extending in the axial direction on the outer periphery of a synthetic resin monofilament and twisted. The nominal wire for electric wiring according to claim 1, comprising a wire or a composite twisted wire in which a plurality of the metal wire fitting resin wires are twisted. 5. The wire for electrical wiring according to claim 1, wherein said synthetic resin monofilament is obtained by melt spinning and hot drawing of a polyester resin. line. 6. The metal wire according to claim 1, wherein the metal wire is made of a steel wire, a copper wire or an aluminum wire, and has a diameter of 0.5 to 3.0 mm. Nominal wire for electrical wiring.